<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<div id="app">
  <h2>总价格：{{totalPrice}}</h2>
</div>

<script src="../js/vue.js"></script>
<script>
  const app = new Vue({
    el: '#app',
    data: {
      books: [
        {id:110, name: 'Unix编程艺术', price: 110},
        {id:111, name: '代码大全', price: 149},
        {id:112, name: '深入理解计算机原理', price: 179},
        {id:113, name: '现代操作系统', price: 114},
      ]
    },
    computed: {
      totalPrice: function () {
        // 流
        return this.books.map(o => o.price).reduce((pre, current) => pre + current, 0)

        let result = 0;
        // 普通语法
        // for (let i = 0; i < this.books.length; i++) {
        //   result += this.books[i].price
        // }
        // return result
        // es6语法
        // for (let i in this.books) {
        //   result += this.books[i].price
        // }
        // return result

        // for (let book of this.books) {
        //   result += book.price;
        // }
        // return result
      }
    }
  })
</script>
</body>
</html>
